J band (infrared), an atmospheric transmission window centred on 1.25 μm
J band (JRC), radio frequency bands from 139.5 to 140.5 and 148 to 149 MHz
J band (NATO), a radio frequency band from 10 to 20 GHz
This disambiguation page lists articles associated with the title J band. If an internal link led you here, you may wish to change the link to point directly to the intended article.